Might have more to do with a limited franchise with the years now ticking by before Aena has to bid to run the airport again which they might lose.
This might also explain why the council is funding the link to Parkway on behalf of the council owned LLAL as Anea would never get any investment back for the remaining years. It also puts into question about any future investment by Aena after the present upgrade is finished apart from care and maintenance.